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from __future__ import annotations
from unittest import mock
from kombu.utils.objects import cached_property
class test_cached_property:
def test_deleting(self):
class X:
xx = False
@cached_property
def foo(self):
return 42
@foo.deleter
def foo(self, value):
self.xx = value
x = X()
del x.foo
assert not x.xx
x.__dict__['foo'] = 'here'
del x.foo
assert x.xx == 'here'
def test_when_access_from_class(self):
class X:
xx = None
@cached_property
def foo(self):
return 42
@foo.setter
def foo(self, value):
self.xx = 10
desc = X.__dict__['foo']
assert X.foo is desc
assert desc.__get__(None) is desc
assert desc.__set__(None, 1) is desc
assert desc.__delete__(None) is desc
assert desc.setter(1)
x = X()
x.foo = 30
assert x.xx == 10
del x.foo
def test_locks_on_access(self):
class X:
@cached_property
def foo(self):
return 42
x = X()
# Getting the value acquires the lock, and may do so recursively
# on Python < 3.12 because the superclass acquires it.
with mock.patch.object(X.foo, 'lock') as mock_lock:
assert x.foo == 42
mock_lock.__enter__.assert_called()
mock_lock.__exit__.assert_called()
# Setting a value also acquires the lock.
with mock.patch.object(X.foo, 'lock') as mock_lock:
x.foo = 314
assert x.foo == 314
mock_lock.__enter__.assert_called_once()
mock_lock.__exit__.assert_called_once()
# .. as does clearing the cached value to recompute it.
with mock.patch.object(X.foo, 'lock') as mock_lock:
del x.foo
assert x.foo == 42
mock_lock.__enter__.assert_called_once()
mock_lock.__exit__.assert_called_once()
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